Study On The Purified Technology Of Epoxy Fatty Acid Ester

With excellent solubility and fuel property, fatty acid ester has become an important part of the chemical industry. Nowadays, people have been less dependent on petrochemical products like before. Fatty acid ester has bought considerable economic benefits and it has strategic significances for the development of green chemistry at the same time. This study focuses on the separation and epoxidation of the mixed fatty acid ester, as well as its purification process. It mainly includes the following three aspects:1) Low eutectic solvent concentration and high purity of unsaturated fatty acid methyl esterThe experiment adopted urea complexion to separate saturated and unsaturated fatty acid methyl ester and it got the optimal technological conditions by conducting the single factor experiment. The detailed information about the optimal technological conditions is as follows:the proportion of mixed fatty acid methyl ester (w), urea (w), and methanol (v) is 1:0.67:2.33; the inclusion temperature is 6℃; the inclusion time is 18 hours. The fatty acid methyl ester with high purity obtained through the inclusion for just one time is polyunsaturated fatty acid methyl ester. By combining the choline chloride with the urea in the crystalline clathrate, this experiment realized the separation of the urea and the saturated fatty acid methyl ester. And then the eutectic solvent was formed as a result of the combination of the choline chloride and the urea. This method is simple and effective, it is good for the environmental protection, and it also has an efficient separation effect.2) The research process for the epoxidized soybean oilBy conducting orthogonal experiment and considering the real economic benefits, the optimal production scheme for the epoxidized soybean oil without any solvent is as follows:20 grams of soybean oil, hydrogen peroxide and double bond with a mole ratio of 1.5:1,3 grams of formic acid; the reaction time is 6 hours; the mixing speed is 240 rpm; the reaction temperature is 63℃; and the epoxy value is 6.26.3) The purification of the epoxy soybean oil By comparing the products with water elution acid and the products with DES washing acid, we can conclude that the effect of DES washing is much better than water elution. By conducting orthogonal experiment and considering the real economic benefits, the optimal production scheme for the purification of the epoxy soybean oil is as follows:the volume ratio of DES and epoxy soybean oil is 1:1; the washing time is 6 minutes; the stirring speed is within 40 rpm; acid value are reduced to 0.42. The experimental data shows that DES has limited abilities to combine with formic acid. When the combination of DES and formic acid reaches to a certain extent, we should reduce pressure distillation to remove the formic acid. In this way, DES can be reused and the green environmental protection technology with no waste acid and no wastewater can be truly realized.